Rocking chair base



FIG. 1 is a perspective view thereof;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a right side view thereof; a left side view being a mirror image thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof.

The broken lines shown in FIG. 1 are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a rocking chair base, as shown and described. 